What are teh benifits between benching with a barbell to benching with dumbells?

I've been benching with my chest with dumbells instead of benching with a barbell. Are there any benifits from switching on and off with dumbell and barbell? Would it be ok if I just bench with dumbells and never bench with a barbell?

especially when you roll your fucking dumbells across the weightrack like a bowling ball. I hate that shit. If your so much of a man that you can bench 130 pound dumbells pick that shit up and rerack it so you dont crush my feet when Im doing inclines you fuckin asshole.